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      <h4 style="padding-bottom:8px;border-bottom:1px solid #ddd;">1. 通用选择器</h4>
      <pre style="max-width:100%;overflow-x:auto;margin:10px 0px;"><code class="apache hljs">* { <span class="hljs-attribute">margin</span>: 0; padding: 0; }</code></pre>
       <h4 style="padding-bottom:8px;border-bottom:1px solid #ddd;">2. 元素选择器</h4>
      <pre style="max-width:100%;overflow-x:auto;"><code class="apache hljs"><span class="hljs-attribute">p</span> { line-height: 1.5em; }<span class="hljs-attribute">h2</span> { color: #696969; }</code></pre>
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